SEA-FISHERIES LABORATORY. 497 



Fig. 63. Dorsal view of the gills of the left side in their 

 natural position, lying upon the thoracic 

 epimera. The roofs of the branchial and pre- 

 branchial chambers have be^n removed. The 

 scaphognathite has been turned over to the 

 inner side, in order to show the maxillipedes. 

 The flabellum of the first maxillipede is shown 

 lying upon the gills (the longitudinal axis of 

 the body is at an angle of 60° with the long 

 axis of this plate), x 1. 



Fig. 64. Yiew of the branchial chamber of the left side. 

 Each gill has been removed at its base, so that 

 only the points of attachment of the gills are 

 shown. The scaphognathite and first maxilli- 

 pede (with flabellum) have been removed. By 

 removing the gills the flabella of the second 

 and third maxillipedes are exposed, x 1. 



Plate XL 



Fig. 65. Diagrammatic transverse section across a gill, 

 showing the branchial septum, the afferent and 

 efferent vessels and the lamellae, x 3. 



Fig. 66. Longitudinal section through a gill in the 

 region of the afferent vessel. x 100. 



Fig. 67. Transverse section through a gill, to show 

 especially the branchial excretory cells in the 

 septum, x 24. 



Fig. 68. A dissection of the nervous system from above. 

 The alimentary canal has been cut through the 

 region of the oesophagus and removed, but the 

 stomatogastric system is shown. The nerves 

 arising from the left side of the cerebral 

 ganglia are alone shown. Those of the right 

 side have been cut, only the nerves arising 

 from the right side of the thoracic ventral mass 

 are shown. The abdominal nerve is only 

 shown as far as the anterior region of the 

 abdomen, x 1. 



